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1、ALLUMINIOELEGHEMemorieGravityandlowpressurediecastingofaluminiumalloys:atechnicalandeconomicalbenchmarkF.Bonollo,J.Urban,B.Bonatto,M.BotterAmongtheinnovativeandconventionalfoundryprocessesforAluminiumalloys,lowpressurediecastingischaracterisedbyseveraladvantages,
2、includinghighyield,excellentcontrolofoperativeparameters,goodmetallurgicalandtechnologicalquality.Thisprocessisoften(andincorrectly)associatedonlytotheproductionofautomotivewheels,whileitisimprovingitspotentialbothtowardsotherautomotivecomponentsandnon-automotive
3、parts.Thepaperisaimedatshowingthepotentialoflowpressurediecastingfortheproductionofsafetyboxes,tobeemployedinchemical,petrolandoff-shoreplants.Thispotentialisexaminedbothintechnicalandeconomicalterms,andiscomparedwiththatofferedbyotherconventionalAluminiumfoundry
4、processes,suchaspermamentmouldgravitydiecasting.Keywords:aluminiumalloys,foundry,lowpressurediecasting,defects,materialscharacterisation,equipmentsINTRODUCTIONagaintowardsthefurnace.Thevariouspartsofthediearethenseparated,andthecastingisfinallyextracted.Theincrea
5、singnumberofapplicationsandofproductsistheSpecificattentionhastobepaidtothedesignofthedie,tobestproofofthesuccessofAluminiumalloysfoundry.Thiscontrolbymeansofpropercoolingcircuits,thesolidifica-isprobablyoneofthemostdynamicfieldsinsidemanufac-tionpathofthealloy.T
6、hemassiveregionofthecastinghasturingandengineering.Thewell-knownadvantagesasso-tobethelastonetosolidifyandmustbeplacedneartotheciatedtotheuseofAluminiumalloys(lightweight,goodmechanicalbehaviour,goodcorrosionresistance,etc.)con-astitutethedrivingforcefortheintrod
7、uction,ononehand,ofnewapplicationsanddesignand,ontheotherhand,forthedevelopmentofnewprocessingsolutions.Variousprocessesarenowcompeting,toachievebotheconomicallyandtech-nologicallyadvantageousproductionofAluminiumalloyscastings.Thegeneralscenarioisdescribedinaqui
8、tewideli-terature[1-10]andisschematicallyshowninFigures1a(part-process-weightchart)and1b(processvsquality–intermsofgasentrapment–chart).Amongthemostinteresting
